WO2012043588A1 - Method for making mold and material for making mold - Google Patents
Method for making mold and material for making mold Download PDFInfo
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- WO2012043588A1 WO2012043588A1 PCT/JP2011/072122 JP2011072122W WO2012043588A1 WO 2012043588 A1 WO2012043588 A1 WO 2012043588A1 JP 2011072122 W JP2011072122 W JP 2011072122W WO 2012043588 A1 WO2012043588 A1 WO 2012043588A1
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- mold
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- specific gravity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
Definitions
- the present invention relates to a mold molding method and a mold molding material used in the method in sand mold molding of a cast product.
- a binder is kneaded and accommodated in a mold frame, and the foundry sand is cured to mold a mold.
- the mold frame is usually a rectangular parallelepiped, and its size is determined by the maximum width, height, and length of the product.
- the gap is wide due to a product shape that is not similar to the mold metal frame, and thus the gap must be filled with a large amount of foundry sand.
- Patent Document 1 a method has been proposed in which hemispherical iron cups are spot welded to form iron spherical hollow balls having gaps and placed in foundry sand. Specifically, in this method, when filling the casting frame with foundry sand, the hemispherical cup is aligned with the gap generated between the casting frame and the product depending on the shape of the product, and joined by spot welding. Arrange hollow balls. This makes it possible to reduce the amount of foundry sand and binder used with high versatility. Moreover, the pressure of the internal expansion air by molten metal heat
- the bulk specific gravity of the mold differs depending on the material used, and the balance is poor because the mold weight increases and the center of gravity is biased during handling, and the crane is adversely affected when the mold is suspended.
- the hollow balls proposed in Patent Document 1 have a low bonding strength because they are bonded by the spot welding method, and the welded portion of the hollow balls is used in mold ballasting operations such as unpacking / collecting operations using a breaker. There is a problem of durability of breaking.
- this hollow ball needs to have a space inside the mold and must be used in the space, the advantage of being hollow due to sand entering from the gap is lost when the hollow ball is used simultaneously with molding.
- the present invention has a high versatility, can reduce the amount of casting sand used, has durability, and can be used while maintaining a hollow without changing workability. It aims to provide molding materials for molds.
- the molding sand in which the hollow spheres formed without gaps are kneaded with the binder.
- the mold is formed by placing them between the two.
- the hollow sphere is an iron ball.
- the hollow sphere is formed by processing a metal plate into a hemispherical shape and joining the hemispherical metal plate by full circumference welding. It is a thing.
- the hollow sphere has a mass of 1 kg or more and 5 kg or less and an outer diameter of 50 mm or more and 250 mm or less.
- the specific gravity of the hollow sphere is in the range of 0.5 to 2.0 times the specific gravity of the foundry sand.
- the hollow sphere is composed of two or more kinds having different outer diameters.
- the mold molding material of the present invention is a molding material that is used for molding a mold by being arranged between a plurality of foundry sands, and is formed of hollow spheres formed without gaps, and the specific gravity of the hollow spheres is the casting. It is in the range of 0.5 to 2.0 times the specific gravity of sand.
- the hollow spheres formed without gaps are used by being placed between the foundry sand, so that the versatility is high and the amount of foundry sand and binder used is reduced. Moreover, since the hollow sphere is formed without a gap, it is possible to avoid the intrusion of foundry sand and to secure a hollow space. Note that “no gap” indicates a state where at least intrusion of foundry sand from the outside is prevented.
- the method for producing the hollow sphere is not particularly limited, but a method having a required strength and capable of being manufactured at low cost is desirable.
- Preferable examples include a method in which a metal plate is processed into a hemispherical cup shape, the openings of the hemispherical cup are brought into contact with each other, and joined by full circumference welding. The all-around welding of the joining portion gives the joining strength between the hemispherical cups and improves the durability. Moreover, the intrusion of the foundry sand can be prevented and the hollow state can be always maintained, and simultaneous molding with the foundry sand can be performed without providing a space inside the mold.
- the material of the hollow sphere is not limited to a special one, but it is desirable that the hollow sphere has a strength that does not hinder the internal expansion or mold dispersion caused by heating during casting, such as an iron ball (made of iron material or steel material). It is desirable to configure. Further, by limiting the use area, it can be used only in a temperature area where the strength of the iron plate does not extremely decrease, and by providing a certain size of sanding, the leakage of the molten metal can be prevented.
- the plate thickness is determined in consideration of the mass of the iron ball in addition to the strength.
- the hollow sphere preferably has a small specific gravity difference from the foundry sand. That is, it is optimal that the hollow sphere mass has a specific gravity substantially equivalent to that of foundry sand having the same volume. If the bulk specific gravity of the hollow sphere is too large, the workability deteriorates due to the overload in the movement and transportation of the mold and the weight balance deviation due to the eccentricity of the center of gravity, and if the bulk specific gravity is small, the hollow sphere moves when filling the casting sand. As a result, workability deteriorates. In order to reduce these influences, the hollow sphere used preferably has a mass of 1 kg or more and 5 kg or less and a diameter of 50 mm or more and 250 mm or less.
- the specific gravity of the hollow sphere is preferably in the range of 0.5 to 2.0 times the specific gravity of the foundry sand used. Furthermore, it is more desirable that the specific gravity of the hollow sphere is 0.75 times or more and 1.25 times or less the specific gravity of the foundry sand used. This makes it easy to balance the weight of the mold, and when it is accommodated in the mold frame (cast frame), it is difficult for the float to sink due to the difference in specific gravity. If the specific gravity of the hollow sphere (including the hollow portion, bulk specific gravity) is less than 0.5 times the specific gravity of the foundry sand, the hollow sphere is relatively light and difficult to balance the mass. When placed in between, the hollow sphere is likely to float.
- the specific gravity of the hollow spheres exceeds 2.0 times the specific gravity of the foundry sand, the hollow spheres are relatively heavy and difficult to balance the mass. Prone to occur. That is, by reducing the specific gravity difference, the influence on the overload and the center of gravity in mold handling is reduced, and in vibration molding, there is an effect of preventing flow and separation such as settling and levitation. In addition, it is effective in preventing crushing deformation of a polystyrene foam wooden mold that is being used in recent years.
- FIG. 1 It is a figure which shows the manufacturing process of the hollow sphere in one Embodiment of this invention. Similarly, it is a figure which shows the state with which casting sand and the hollow sphere were filled in the casting frame. Similarly, it is a partially enlarged view showing a filled state of the hollow sphere. Similarly, it is a figure which shows the casting_mold
- FIG. Sphere 1 Press-molded into a hemispherical cup using an iron plate, butted so that the opening sides of the two hemispherical cups 1a and 1b face each other as shown in FIG. Sphere 1 is obtained.
- reference numeral 2 denotes an all-around welding site.
- a plurality of iron balls 1 are prepared.
- the iron ball 1 preferably has a mass of 1 kg or more and 5 kg or less and an outer diameter of 50 mm or more and 250 mm or less.
- the binder is kneaded so as to have a minimum compressive strength that does not flow after curing so that the casting sand does not leak from the gap between the cast frame 10 and the wooden mold 11 that is the product shape, and the gaps and ventilation holes of the cast frame 10.
- the specific gravity of the iron ball 1 is in the range of 0.5 to 2.0 times the specific gravity of the foundry sand with respect to the foundry sand.
- the foundry sand is filled into the casting frame 10 to form the sand mold 12 while being blended with the iron ball 1 before being hardened.
- the iron ball 1 is arranged at a predetermined distance from the surface so as not to directly touch the surface of the wooden mold 11, that is, the surface to be cast. Note that there is no problem even if the iron ball 1 is in contact with the casting frame 10.
- the whole casting frame 10 is turned upside down, and after the wooden mold 11 is pulled out, the molten metal is cast into the space formed between the sand molds 12 to obtain a product 13. It is done.
- the iron ball 1 is also put into the collecting device shaker together with foundry sand and other hardware.
- the iron balls 1 are separated and collected by a method different from other hardware used for a chill or a core metal. During the collection, the iron ball 1 is unlikely to float and sink, and there is no damage due to the collection. Further, a hollow space is maintained through casting and recovery, and repeated use is possible without causing intrusion of foundry sand.
- Example 1 a metal frame having an internal volume of width 2500 mm ⁇ length 4,500 mm ⁇ height 3,000 mm as a product casting weight 50 t was used.
- the sand was mullite artificial sand (specific gravity 1.67), and was produced with a self-hardening mold using alkaline phenol as a binder.
- a product having a shape as shown in FIG. 3 was formed by placing an iron ball 1 in a metal frame within a range of 300 mm or more away from foundry sand and a wooden mold. The individual iron balls at this time had an outer diameter of 140 mm and a specific gravity of approximately 1.6 equivalent to that of sand.
- Example 2 when using zircon sand (specific gravity 2.90) and a self-hardening mold made of alkali phenol, an iron ball having an outer diameter of 120 mm and a specific gravity of 2.5 was used.
- Reference Example 1 (Mullite artificial sand) As Reference Example 1, an iron ball having an outer diameter of 160 mm, a weight of 7.5 kg, and a specific gravity of 3.5 was used in producing a mold having the same conditions as in Example 1. Since many iron balls were put in the direction with many gaps, the center of gravity was eccentric, and the mold and crane were sometimes damaged when the mold was reversed. Further, the mold mass itself becomes heavy, and there is a possibility that the hoist (crane or reversing machine) is overloaded. In order to avoid this, it is necessary to limit the amount of iron balls used, and the effect of reducing the amount of sand used is smaller than in the above examples. Also, the handling of the operator (considering holding it by hand) was heavy and the workability deteriorated.
- Reference Example 2 (Zircon sand) As a reference example 2, an iron ball having an outer diameter of 150 mm, a weight of 0.9 kg, and a specific gravity of 0.6 was used in manufacturing a mold under the same conditions as in Example 2. When sand was dropped from the sand kneader into the mold, the iron ball might move with that momentum, and the workability decreased because the position was corrected at any time. In addition, some were found to be weak and damaged when the mold was dropped.
- the present invention is not limited to the above-described embodiment, and can be appropriately modified and improved.
- the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
- the hollow spheres formed without gaps are arranged between the foundry sand kneaded with the binder. Then, since the mold is molded, there is an effect that the amount of sand used and the amount of additive used therewith can be reduced by filling each shape of the mold with a general-purpose hollow sphere instead of sand.
- the hollow sphere at a position away from the product, when polishing the casting, it is possible to suppress the unburned residual additive in the part that is away from the product and has less heat influence, and to reduce the polishing regeneration process There is.
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Abstract
The purpose of the present invention is to reduce the amount of molding sands used in a mold having broad utility. Provided is a method for making a mold, including making a mold (sand mold) (12) by curing molding sands with a binder, wherein hollow spheres (1) formed without a gap are arranged between the molding sands kneaded with the binder to make the mold. The hollow sphere (1) is preferably formed by processing metal plates into a hemispherical form and bonding the hemispherical metal plates to each other by welding the entire circumferences thereof. With the specific gravity of 0.5 to 2.0 times that of the molding sand, the hollow sphere (1) has broad utility and is capable of reducing the amount of sands necessary for filling and the amount of additives used with the sands. The use of iron balls having the specific gravity equal to that of the used sand makes it possible to solve the problems of unbalance and overload at the time of handling a mold frame, and to impart an excellent durability due to an appropriate strength.
Description
この発明は鋳造品の砂型造型における、鋳型造型方法および該方法に用いる鋳型用造型材に関するものである。
The present invention relates to a mold molding method and a mold molding material used in the method in sand mold molding of a cast product.
従来、鋳物砂を用いて造型する造型方法では、鋳物砂に粘結剤を混練して鋳型金枠内に収容し、前記鋳物砂を硬化させて鋳型を造型している。
ところで、鋳型金枠は通常直方体であり、そのサイズは製品の最大幅、高さ、長さにより決定される。この鋳型金枠では、鋳型金枠と相似ではない製品形状によって隙間が広く空くため、該隙間には、大量の鋳物砂を充填させなければならない。
従来は、これに対し、製品に沿うような形状の仕切りを金枠内面に取付けるタイプの冶具やパイプ型、ブロック型の冶具を砂と共に充填させるタイプの冶具による砂抜き法が提案されている。しかしこれらの冶具は汎用性が低く多品種生産には不向きである。 Conventionally, in a molding method in which molding is performed using foundry sand, a binder is kneaded and accommodated in a mold frame, and the foundry sand is cured to mold a mold.
Incidentally, the mold frame is usually a rectangular parallelepiped, and its size is determined by the maximum width, height, and length of the product. In this mold metal frame, the gap is wide due to a product shape that is not similar to the mold metal frame, and thus the gap must be filled with a large amount of foundry sand.
Conventionally, a sand removal method using a jig of a type in which a partition having a shape conforming to a product is attached to the inner surface of a metal frame, a pipe type, or a block type jig together with sand has been proposed. However, these jigs have low versatility and are not suitable for multi-product production.
ところで、鋳型金枠は通常直方体であり、そのサイズは製品の最大幅、高さ、長さにより決定される。この鋳型金枠では、鋳型金枠と相似ではない製品形状によって隙間が広く空くため、該隙間には、大量の鋳物砂を充填させなければならない。
従来は、これに対し、製品に沿うような形状の仕切りを金枠内面に取付けるタイプの冶具やパイプ型、ブロック型の冶具を砂と共に充填させるタイプの冶具による砂抜き法が提案されている。しかしこれらの冶具は汎用性が低く多品種生産には不向きである。 Conventionally, in a molding method in which molding is performed using foundry sand, a binder is kneaded and accommodated in a mold frame, and the foundry sand is cured to mold a mold.
Incidentally, the mold frame is usually a rectangular parallelepiped, and its size is determined by the maximum width, height, and length of the product. In this mold metal frame, the gap is wide due to a product shape that is not similar to the mold metal frame, and thus the gap must be filled with a large amount of foundry sand.
Conventionally, a sand removal method using a jig of a type in which a partition having a shape conforming to a product is attached to the inner surface of a metal frame, a pipe type, or a block type jig together with sand has been proposed. However, these jigs have low versatility and are not suitable for multi-product production.
このため、特許文献１に示すように、半球状の鉄製のカップ同士を点溶接して、隙間を有する鉄球状の中空ボールにして鋳物砂の中に配する方法が提案されている。
この方法では具体的に、鋳枠に鋳物砂を充填させる際に、製品の形状によって鋳枠と製品の間に発生する隙間に、半球形のカップを一定の隙間で合わせ、点溶接で接合した中空ボールを配する。これにより、高い汎用性で鋳物砂および粘結剤使用量を低減することが可能になる。また、カップの接合方法を点溶接として隙間を確保することで溶湯熱による内部膨張空気の圧力を逃がすことを可能にしている。 For this reason, as shown inPatent Document 1, a method has been proposed in which hemispherical iron cups are spot welded to form iron spherical hollow balls having gaps and placed in foundry sand.
Specifically, in this method, when filling the casting frame with foundry sand, the hemispherical cup is aligned with the gap generated between the casting frame and the product depending on the shape of the product, and joined by spot welding. Arrange hollow balls. This makes it possible to reduce the amount of foundry sand and binder used with high versatility. Moreover, the pressure of the internal expansion air by molten metal heat | fever can be released by ensuring a clearance gap by making the joining method of a cup into spot welding.
この方法では具体的に、鋳枠に鋳物砂を充填させる際に、製品の形状によって鋳枠と製品の間に発生する隙間に、半球形のカップを一定の隙間で合わせ、点溶接で接合した中空ボールを配する。これにより、高い汎用性で鋳物砂および粘結剤使用量を低減することが可能になる。また、カップの接合方法を点溶接として隙間を確保することで溶湯熱による内部膨張空気の圧力を逃がすことを可能にしている。 For this reason, as shown in
Specifically, in this method, when filling the casting frame with foundry sand, the hemispherical cup is aligned with the gap generated between the casting frame and the product depending on the shape of the product, and joined by spot welding. Arrange hollow balls. This makes it possible to reduce the amount of foundry sand and binder used with high versatility. Moreover, the pressure of the internal expansion air by molten metal heat | fever can be released by ensuring a clearance gap by making the joining method of a cup into spot welding.
しかしながら、従来の方法では、使用する材料によって鋳型のかさ比重が異なり、ハンドリングに際して鋳型重量の増加や重心が偏るためバランスが悪くなり、鋳型を吊り下げる際のクレーンへの悪影響が出ることがわかっている。
また、特許文献１で提案されている中空ボールでは、点溶接方式で接合されているため接合強度が低く、ブレーカーを用いた解枠・回収作業などの鋳型バラシ作業においては中空ボールの溶接部が破断するという耐久性の問題がある。また、この中空ボールは鋳型内部に空間を設け、その空間内に使用する必要があるため、造型と同時に中空ボールを使用した場合には隙間より砂が入ることにより中空であることの利点が損なわれ、また、中空部への砂の侵入によってかさ密度が変わって鋳型としてのバランスが損なわれたり、鋳物砂回収時の回収効率が悪くなるという問題がある。 However, in the conventional method, the bulk specific gravity of the mold differs depending on the material used, and the balance is poor because the mold weight increases and the center of gravity is biased during handling, and the crane is adversely affected when the mold is suspended. Yes.
In addition, the hollow balls proposed inPatent Document 1 have a low bonding strength because they are bonded by the spot welding method, and the welded portion of the hollow balls is used in mold ballasting operations such as unpacking / collecting operations using a breaker. There is a problem of durability of breaking. In addition, since this hollow ball needs to have a space inside the mold and must be used in the space, the advantage of being hollow due to sand entering from the gap is lost when the hollow ball is used simultaneously with molding. In addition, there is a problem that the bulk density is changed due to the intrusion of sand into the hollow portion and the balance as a mold is lost, or the recovery efficiency at the time of recovery of the casting sand is deteriorated.
また、特許文献１で提案されている中空ボールでは、点溶接方式で接合されているため接合強度が低く、ブレーカーを用いた解枠・回収作業などの鋳型バラシ作業においては中空ボールの溶接部が破断するという耐久性の問題がある。また、この中空ボールは鋳型内部に空間を設け、その空間内に使用する必要があるため、造型と同時に中空ボールを使用した場合には隙間より砂が入ることにより中空であることの利点が損なわれ、また、中空部への砂の侵入によってかさ密度が変わって鋳型としてのバランスが損なわれたり、鋳物砂回収時の回収効率が悪くなるという問題がある。 However, in the conventional method, the bulk specific gravity of the mold differs depending on the material used, and the balance is poor because the mold weight increases and the center of gravity is biased during handling, and the crane is adversely affected when the mold is suspended. Yes.
In addition, the hollow balls proposed in
この発明は上記のような課題を解決するため、汎用性が高く、鋳物砂の使用量を低減でき、耐久性を持ち、作業性を変えずに中空を維持したまま使用が可能な鋳型造型方法および鋳型用造型材の提供を目的としている。
In order to solve the above-mentioned problems, the present invention has a high versatility, can reduce the amount of casting sand used, has durability, and can be used while maintaining a hollow without changing workability. It aims to provide molding materials for molds.
すなわち、本発明の鋳型造型方法における第１の態様によると、鋳物砂を粘結剤により硬化させ鋳型を造型する鋳型造型方法において、隙間なく形成された中空球体を粘結剤と混練した鋳物砂の間に配置して前記鋳型の造型を行う。
That is, according to the first aspect of the mold molding method of the present invention, in the mold molding method in which the molding sand is hardened with a binder and the mold is molded, the molding sand in which the hollow spheres formed without gaps are kneaded with the binder. The mold is formed by placing them between the two.
本発明の鋳型造型方法における第２の態様によると、前記第１の態様において、前記中空球体が鉄球である。
According to the second aspect of the mold making method of the present invention, in the first aspect, the hollow sphere is an iron ball.
本発明の鋳型造型方法における第３の態様によると、前記第１または第２の態様において、前記中空球体は、金属板を半球状に加工し半球状の該金属板を全周溶接により接合されたものである。
According to a third aspect of the mold making method of the present invention, in the first or second aspect, the hollow sphere is formed by processing a metal plate into a hemispherical shape and joining the hemispherical metal plate by full circumference welding. It is a thing.
本発明の鋳型造型方法における第４の態様によると、前記第１の態様において、前記中空球体は、質量が１ｋｇ以上、５ｋｇ以下で、外径が５０ｍｍ以上、２５０ｍｍ以下である。
According to a fourth aspect of the mold making method of the present invention, in the first aspect, the hollow sphere has a mass of 1 kg or more and 5 kg or less and an outer diameter of 50 mm or more and 250 mm or less.
本発明の鋳型造型方法における第５の態様によると、前記第１の態様において、前記中空球体の比重が、前記鋳物砂の比重の０．５倍から２．０倍の範囲にある。
According to the fifth aspect of the mold making method of the present invention, in the first aspect, the specific gravity of the hollow sphere is in the range of 0.5 to 2.0 times the specific gravity of the foundry sand.
本発明の鋳型造型方法における第６の態様によると、前記第１の態様において、前記中空球体は、外径の異なる２種以上のものからなる。
According to a sixth aspect of the mold making method of the present invention, in the first aspect, the hollow sphere is composed of two or more kinds having different outer diameters.
また、本発明の鋳型用造型材は、鋳物砂間に複数配置されて鋳型の造型に用いられる造型材であって、隙間なく形成された中空球体からなり、該中空球体の比重が、前記鋳物砂の比重の０．５倍から２．０倍の範囲にある。
The mold molding material of the present invention is a molding material that is used for molding a mold by being arranged between a plurality of foundry sands, and is formed of hollow spheres formed without gaps, and the specific gravity of the hollow spheres is the casting. It is in the range of 0.5 to 2.0 times the specific gravity of sand.
本発明では、隙間なく形成された中空球体が鋳物砂の間に配置して使用されるので、汎用性が高く、鋳物砂や粘結剤の使用量が削減される。また、中空球体は隙間なく形成されているので鋳物砂の侵入を回避でき、中空空間の確保がなされる。なお、隙間なくとは、少なくとも外部からの鋳物砂の侵入が防止される状態を示している。
In the present invention, the hollow spheres formed without gaps are used by being placed between the foundry sand, so that the versatility is high and the amount of foundry sand and binder used is reduced. Moreover, since the hollow sphere is formed without a gap, it is possible to avoid the intrusion of foundry sand and to secure a hollow space. Note that “no gap” indicates a state where at least intrusion of foundry sand from the outside is prevented.
中空球体の製造方法は特に限定されないが、必要な強度を有し、かつ低コストでの製作が可能な方法が望ましい。好適には、金属板を半球カップ状に加工し半球カップの開口部同士を突き合わせて全周溶接により接合する方法が挙げられる。
接合部の全周溶接は、半球形状のカップ同士の接合強度をもたせ耐久性を向上させる。また、鋳物砂の侵入を防ぎ中空状態を常に維持でき、別途鋳型内部に空間を持たせなくとも鋳物砂との同時造型を可能にする。 The method for producing the hollow sphere is not particularly limited, but a method having a required strength and capable of being manufactured at low cost is desirable. Preferable examples include a method in which a metal plate is processed into a hemispherical cup shape, the openings of the hemispherical cup are brought into contact with each other, and joined by full circumference welding.
The all-around welding of the joining portion gives the joining strength between the hemispherical cups and improves the durability. Moreover, the intrusion of the foundry sand can be prevented and the hollow state can be always maintained, and simultaneous molding with the foundry sand can be performed without providing a space inside the mold.
接合部の全周溶接は、半球形状のカップ同士の接合強度をもたせ耐久性を向上させる。また、鋳物砂の侵入を防ぎ中空状態を常に維持でき、別途鋳型内部に空間を持たせなくとも鋳物砂との同時造型を可能にする。 The method for producing the hollow sphere is not particularly limited, but a method having a required strength and capable of being manufactured at low cost is desirable. Preferable examples include a method in which a metal plate is processed into a hemispherical cup shape, the openings of the hemispherical cup are brought into contact with each other, and joined by full circumference welding.
The all-around welding of the joining portion gives the joining strength between the hemispherical cups and improves the durability. Moreover, the intrusion of the foundry sand can be prevented and the hollow state can be always maintained, and simultaneous molding with the foundry sand can be performed without providing a space inside the mold.
前記中空球体の材質は特別のものに限定されないが、鋳造時の加熱に伴う内部膨張や鋳型バラシなどに支障のない強度を有するのが望ましく、鉄球（鉄素材や鋼素材からなるもの）で構成するのが望ましい。
また使用領域を限定することにより、鉄板の強度が極端に低下しない温度領域に限って使用し、砂付けを一定寸法設けることにより溶湯の漏れを防止できる。板厚については、強度の他に鉄球の質量も考慮して定められる。 The material of the hollow sphere is not limited to a special one, but it is desirable that the hollow sphere has a strength that does not hinder the internal expansion or mold dispersion caused by heating during casting, such as an iron ball (made of iron material or steel material). It is desirable to configure.
Further, by limiting the use area, it can be used only in a temperature area where the strength of the iron plate does not extremely decrease, and by providing a certain size of sanding, the leakage of the molten metal can be prevented. The plate thickness is determined in consideration of the mass of the iron ball in addition to the strength.
また使用領域を限定することにより、鉄板の強度が極端に低下しない温度領域に限って使用し、砂付けを一定寸法設けることにより溶湯の漏れを防止できる。板厚については、強度の他に鉄球の質量も考慮して定められる。 The material of the hollow sphere is not limited to a special one, but it is desirable that the hollow sphere has a strength that does not hinder the internal expansion or mold dispersion caused by heating during casting, such as an iron ball (made of iron material or steel material). It is desirable to configure.
Further, by limiting the use area, it can be used only in a temperature area where the strength of the iron plate does not extremely decrease, and by providing a certain size of sanding, the leakage of the molten metal can be prevented. The plate thickness is determined in consideration of the mass of the iron ball in addition to the strength.
上記中空球体は、鋳物砂との比重差が小さいのが望ましい。すなわち、中空球体質量は同体積の鋳物砂とほぼ同等の比重とするのが最適である。
中空球体のかさ比重が大きすぎると鋳型の移動や運搬における過荷重、および重心の偏心による重量バランスの偏りによる作業性が悪化し、かさ比重が小さいと鋳物砂を充填する際に中空球体が移動して作業性が悪化する。これらの影響を小さくするために、使用される中空球体は質量が１ｋｇ以上、５ｋｇ以下で、直径が５０ｍｍ以上、２５０ｍｍ以下が望ましい。また、中空球体の比重が使用する鋳物砂の比重の０．５から２．０倍の範囲にあるのが望ましい。さらには、中空球体の比重が使用する鋳物砂の比重の０．７５倍以上、１．２５倍以下であるのが一層望ましい。
これにより鋳型の重量バランスをとりやすくなり、また、鋳型枠（鋳枠）内に収容する際に、比重差による浮沈が生じにくくなる。中空球体の比重（中空部を含む、かさ比重）が、鋳物砂の比重に対し、０．５倍未満であると中空球体が相対的に軽すぎて、質量バランスをとりにくく、また、鋳物砂間に配置した際に中空球体の浮上が生じやすい。一方、中空球体の比重が鋳物砂の比重の２．０倍を超える場合、中空球体が相対的に重すぎて質量バランスをとりにくく、また、鋳物砂間に配置した際に中空球体の沈降が生じやすい。すなわち上記比重差を小さくすることで、鋳型ハンドリングにおける過荷重および重心への影響を少なくし、振動造型においては沈降や浮上などの流動や分離を防ぐ効果がある。また、近年使用されつつある発泡スチロール製木型の潰れ変形防止にも効果がある。 The hollow sphere preferably has a small specific gravity difference from the foundry sand. That is, it is optimal that the hollow sphere mass has a specific gravity substantially equivalent to that of foundry sand having the same volume.
If the bulk specific gravity of the hollow sphere is too large, the workability deteriorates due to the overload in the movement and transportation of the mold and the weight balance deviation due to the eccentricity of the center of gravity, and if the bulk specific gravity is small, the hollow sphere moves when filling the casting sand. As a result, workability deteriorates. In order to reduce these influences, the hollow sphere used preferably has a mass of 1 kg or more and 5 kg or less and a diameter of 50 mm or more and 250 mm or less. The specific gravity of the hollow sphere is preferably in the range of 0.5 to 2.0 times the specific gravity of the foundry sand used. Furthermore, it is more desirable that the specific gravity of the hollow sphere is 0.75 times or more and 1.25 times or less the specific gravity of the foundry sand used.
This makes it easy to balance the weight of the mold, and when it is accommodated in the mold frame (cast frame), it is difficult for the float to sink due to the difference in specific gravity. If the specific gravity of the hollow sphere (including the hollow portion, bulk specific gravity) is less than 0.5 times the specific gravity of the foundry sand, the hollow sphere is relatively light and difficult to balance the mass. When placed in between, the hollow sphere is likely to float. On the other hand, when the specific gravity of the hollow spheres exceeds 2.0 times the specific gravity of the foundry sand, the hollow spheres are relatively heavy and difficult to balance the mass. Prone to occur. That is, by reducing the specific gravity difference, the influence on the overload and the center of gravity in mold handling is reduced, and in vibration molding, there is an effect of preventing flow and separation such as settling and levitation. In addition, it is effective in preventing crushing deformation of a polystyrene foam wooden mold that is being used in recent years.
中空球体のかさ比重が大きすぎると鋳型の移動や運搬における過荷重、および重心の偏心による重量バランスの偏りによる作業性が悪化し、かさ比重が小さいと鋳物砂を充填する際に中空球体が移動して作業性が悪化する。これらの影響を小さくするために、使用される中空球体は質量が１ｋｇ以上、５ｋｇ以下で、直径が５０ｍｍ以上、２５０ｍｍ以下が望ましい。また、中空球体の比重が使用する鋳物砂の比重の０．５から２．０倍の範囲にあるのが望ましい。さらには、中空球体の比重が使用する鋳物砂の比重の０．７５倍以上、１．２５倍以下であるのが一層望ましい。
これにより鋳型の重量バランスをとりやすくなり、また、鋳型枠（鋳枠）内に収容する際に、比重差による浮沈が生じにくくなる。中空球体の比重（中空部を含む、かさ比重）が、鋳物砂の比重に対し、０．５倍未満であると中空球体が相対的に軽すぎて、質量バランスをとりにくく、また、鋳物砂間に配置した際に中空球体の浮上が生じやすい。一方、中空球体の比重が鋳物砂の比重の２．０倍を超える場合、中空球体が相対的に重すぎて質量バランスをとりにくく、また、鋳物砂間に配置した際に中空球体の沈降が生じやすい。すなわち上記比重差を小さくすることで、鋳型ハンドリングにおける過荷重および重心への影響を少なくし、振動造型においては沈降や浮上などの流動や分離を防ぐ効果がある。また、近年使用されつつある発泡スチロール製木型の潰れ変形防止にも効果がある。 The hollow sphere preferably has a small specific gravity difference from the foundry sand. That is, it is optimal that the hollow sphere mass has a specific gravity substantially equivalent to that of foundry sand having the same volume.
If the bulk specific gravity of the hollow sphere is too large, the workability deteriorates due to the overload in the movement and transportation of the mold and the weight balance deviation due to the eccentricity of the center of gravity, and if the bulk specific gravity is small, the hollow sphere moves when filling the casting sand. As a result, workability deteriorates. In order to reduce these influences, the hollow sphere used preferably has a mass of 1 kg or more and 5 kg or less and a diameter of 50 mm or more and 250 mm or less. The specific gravity of the hollow sphere is preferably in the range of 0.5 to 2.0 times the specific gravity of the foundry sand used. Furthermore, it is more desirable that the specific gravity of the hollow sphere is 0.75 times or more and 1.25 times or less the specific gravity of the foundry sand used.
This makes it easy to balance the weight of the mold, and when it is accommodated in the mold frame (cast frame), it is difficult for the float to sink due to the difference in specific gravity. If the specific gravity of the hollow sphere (including the hollow portion, bulk specific gravity) is less than 0.5 times the specific gravity of the foundry sand, the hollow sphere is relatively light and difficult to balance the mass. When placed in between, the hollow sphere is likely to float. On the other hand, when the specific gravity of the hollow spheres exceeds 2.0 times the specific gravity of the foundry sand, the hollow spheres are relatively heavy and difficult to balance the mass. Prone to occur. That is, by reducing the specific gravity difference, the influence on the overload and the center of gravity in mold handling is reduced, and in vibration molding, there is an effect of preventing flow and separation such as settling and levitation. In addition, it is effective in preventing crushing deformation of a polystyrene foam wooden mold that is being used in recent years.
以下に、本発明の一実施形態を添付図面に基づいて説明する。
鉄板を用いて半球カップにプレス成形し、図１に示すように二つの半球カップ１ａ、１ｂの開口側を対向させるように突き合わせ、突き合わせ部分の全周を隙間なく溶接して中空球体としての鉄球１を得る。図中２は、全周溶接部位である。鉄球１は複数を用意する。該鉄球１は、好適には、質量が１ｋｇ以上、５ｋｇ以下で、外径が５０ｍｍ以上、２５０ｍｍ以下である。
一方、鋳枠１０と製品形状となる木型１１と、さらに鋳枠１０の隙間、通気穴より鋳物砂が漏れないよう、硬化後に流動しない最低限度の圧縮強度を有するように粘結剤を混練した自硬性の鋳物砂とを用意する。
上記鋳物砂に対し、前記鉄球１の比重は、前記鋳物砂の比重の０．５倍から２．０倍の範囲にあるものとする。 Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
Press-molded into a hemispherical cup using an iron plate, butted so that the opening sides of the two hemispherical cups 1a and 1b face each other as shown in FIG. Sphere 1 is obtained. In the figure, reference numeral 2 denotes an all-around welding site. A plurality of iron balls 1 are prepared. The iron ball 1 preferably has a mass of 1 kg or more and 5 kg or less and an outer diameter of 50 mm or more and 250 mm or less.
On the other hand, the binder is kneaded so as to have a minimum compressive strength that does not flow after curing so that the casting sand does not leak from the gap between thecast frame 10 and the wooden mold 11 that is the product shape, and the gaps and ventilation holes of the cast frame 10. Prepared self-hardening foundry sand.
The specific gravity of theiron ball 1 is in the range of 0.5 to 2.0 times the specific gravity of the foundry sand with respect to the foundry sand.
鉄板を用いて半球カップにプレス成形し、図１に示すように二つの半球カップ１ａ、１ｂの開口側を対向させるように突き合わせ、突き合わせ部分の全周を隙間なく溶接して中空球体としての鉄球１を得る。図中２は、全周溶接部位である。鉄球１は複数を用意する。該鉄球１は、好適には、質量が１ｋｇ以上、５ｋｇ以下で、外径が５０ｍｍ以上、２５０ｍｍ以下である。
一方、鋳枠１０と製品形状となる木型１１と、さらに鋳枠１０の隙間、通気穴より鋳物砂が漏れないよう、硬化後に流動しない最低限度の圧縮強度を有するように粘結剤を混練した自硬性の鋳物砂とを用意する。
上記鋳物砂に対し、前記鉄球１の比重は、前記鋳物砂の比重の０．５倍から２．０倍の範囲にあるものとする。 Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
Press-molded into a hemispherical cup using an iron plate, butted so that the opening sides of the two
On the other hand, the binder is kneaded so as to have a minimum compressive strength that does not flow after curing so that the casting sand does not leak from the gap between the
The specific gravity of the
前記鋳物砂は、硬化する前に前記鉄球１となじませながら鋳枠１０内に充填して砂型１２を形成する。この際に、鉄球１は、木型１１の表面、すなわち鋳物となる表面と直接触れないように、前記表面から所定の距離を隔てて配置する。なお、鉄球１が鋳枠１０と接しても問題はない。
鋳物砂および鉄球１を鋳枠１０内に充填した後、鋳枠１０ごと上下反転を行い、木型１１を抜いた後に砂型１２間にできた空間に溶湯が鋳込まれて製品１３が得られる。 The foundry sand is filled into thecasting frame 10 to form the sand mold 12 while being blended with the iron ball 1 before being hardened. At this time, the iron ball 1 is arranged at a predetermined distance from the surface so as not to directly touch the surface of the wooden mold 11, that is, the surface to be cast. Note that there is no problem even if the iron ball 1 is in contact with the casting frame 10.
After filling the castingsand 10 and the iron ball 1 into the casting frame 10, the whole casting frame 10 is turned upside down, and after the wooden mold 11 is pulled out, the molten metal is cast into the space formed between the sand molds 12 to obtain a product 13. It is done.
鋳物砂および鉄球１を鋳枠１０内に充填した後、鋳枠１０ごと上下反転を行い、木型１１を抜いた後に砂型１２間にできた空間に溶湯が鋳込まれて製品１３が得られる。 The foundry sand is filled into the
After filling the casting
その後、製品１３を抜いた後、鋳物砂やその他金物と共に鉄球１も回収装置シェーカーに投入する。ブレードの傾斜と振動を用い球形状を生かして、チルや芯金などに用いられるその他金物と別な方法で鉄球１を分別回収する。
回収の際に鉄球１の浮沈などは生じにくく、また、回収による損傷などもない。また、鋳込み、回収を通して中空空間が維持され、鋳物砂の内部侵入も生ずることなく、繰り返し使用が可能である。 Thereafter, after theproduct 13 is removed, the iron ball 1 is also put into the collecting device shaker together with foundry sand and other hardware. By utilizing the spherical shape by using the inclination and vibration of the blade, the iron balls 1 are separated and collected by a method different from other hardware used for a chill or a core metal.
During the collection, theiron ball 1 is unlikely to float and sink, and there is no damage due to the collection. Further, a hollow space is maintained through casting and recovery, and repeated use is possible without causing intrusion of foundry sand.
回収の際に鉄球１の浮沈などは生じにくく、また、回収による損傷などもない。また、鋳込み、回収を通して中空空間が維持され、鋳物砂の内部侵入も生ずることなく、繰り返し使用が可能である。 Thereafter, after the
During the collection, the
実施例１として、製品鋳込み重量５０ｔとして、幅２，５００ｍｍ×長さ４，５００ｍｍ×高さ３，０００ｍｍの内容積を持った金枠を用いた。砂はムライト系人工砂（比重１．６７）とし、粘結剤にアルカリフェノールを用いて自硬性鋳型で製造するものとした。
図３に示すような形状の製品に対し、金枠内に鋳物砂および木型と３００ｍｍ以上を離した範囲に鉄球１を配置して造型した。このときの個々の鉄球は外径１４０ｍｍで、砂とほぼ同等比重１．６を有していた。 As Example 1, a metal frame having an internal volume of width 2500 mm × length 4,500 mm × height 3,000 mm as a product casting weight 50 t was used. The sand was mullite artificial sand (specific gravity 1.67), and was produced with a self-hardening mold using alkaline phenol as a binder.
A product having a shape as shown in FIG. 3 was formed by placing aniron ball 1 in a metal frame within a range of 300 mm or more away from foundry sand and a wooden mold. The individual iron balls at this time had an outer diameter of 140 mm and a specific gravity of approximately 1.6 equivalent to that of sand.
図３に示すような形状の製品に対し、金枠内に鋳物砂および木型と３００ｍｍ以上を離した範囲に鉄球１を配置して造型した。このときの個々の鉄球は外径１４０ｍｍで、砂とほぼ同等比重１．６を有していた。 As Example 1, a metal frame having an internal volume of width 2500 mm × length 4,500 mm × height 3,000 mm as a product casting weight 50 t was used. The sand was mullite artificial sand (specific gravity 1.67), and was produced with a self-hardening mold using alkaline phenol as a binder.
A product having a shape as shown in FIG. 3 was formed by placing an
実施例２としてジルコン砂（比重２．９０）を用い同じくアルカリフェノールによる自硬性鋳型で製造する場合、鉄球には外径１２０ｍｍ、比重は２．５のものを使用した。
In Example 2, when using zircon sand (specific gravity 2.90) and a self-hardening mold made of alkali phenol, an iron ball having an outer diameter of 120 mm and a specific gravity of 2.5 was used.
これら鉄球を使用することにより充填に必要な砂使用量が従来の質量対比２０％低減した。
使用砂とほぼ同等比重の鉄球を用いることで鋳枠ハンドリング時のバランス不安定や過荷重の問題はない。製品より一定距離を保ち充填することで鋳込み時の溶湯の漏れや、解枠時の鉄球への溶損・破損等の熱影響はみられなかった。 By using these iron balls, the amount of sand used for filling was reduced by 20% compared to the conventional mass.
By using an iron ball with almost the same specific gravity as the sand used, there is no problem of balance instability and overload when handling the cast frame. By filling the product at a certain distance from the product, there was no thermal effect such as leakage of the molten metal during casting or melting or breakage of the iron ball during unpacking.
使用砂とほぼ同等比重の鉄球を用いることで鋳枠ハンドリング時のバランス不安定や過荷重の問題はない。製品より一定距離を保ち充填することで鋳込み時の溶湯の漏れや、解枠時の鉄球への溶損・破損等の熱影響はみられなかった。 By using these iron balls, the amount of sand used for filling was reduced by 20% compared to the conventional mass.
By using an iron ball with almost the same specific gravity as the sand used, there is no problem of balance instability and overload when handling the cast frame. By filling the product at a certain distance from the product, there was no thermal effect such as leakage of the molten metal during casting or melting or breakage of the iron ball during unpacking.
参考例１（ムライト系人工砂）
参考例１として、実施例１と同条件の鋳型を製造するに当たり、外径１６０ｍｍ、重さ７．５ｋｇ、比重３．５の鉄球を使用した。隙間の多い方に多くの鉄球を入れることとなるため重心が偏心し、鋳型反転時に鋳型やクレーンが損傷することがあった。
また、鋳型質量そのものが重くなり、起重機（クレーンや反転機）が過荷重に成るおそれがあった。これを避けるためには鉄球の使用量を制限する必要があり、砂の使用量低減効果は上記実施例に比べて小さくなった。また作業者のハンドリング（手で持って作業することも考慮）時も重量物となり作業性が悪化した。 Reference Example 1 (Mullite artificial sand)
As Reference Example 1, an iron ball having an outer diameter of 160 mm, a weight of 7.5 kg, and a specific gravity of 3.5 was used in producing a mold having the same conditions as in Example 1. Since many iron balls were put in the direction with many gaps, the center of gravity was eccentric, and the mold and crane were sometimes damaged when the mold was reversed.
Further, the mold mass itself becomes heavy, and there is a possibility that the hoist (crane or reversing machine) is overloaded. In order to avoid this, it is necessary to limit the amount of iron balls used, and the effect of reducing the amount of sand used is smaller than in the above examples. Also, the handling of the operator (considering holding it by hand) was heavy and the workability deteriorated.
参考例１として、実施例１と同条件の鋳型を製造するに当たり、外径１６０ｍｍ、重さ７．５ｋｇ、比重３．５の鉄球を使用した。隙間の多い方に多くの鉄球を入れることとなるため重心が偏心し、鋳型反転時に鋳型やクレーンが損傷することがあった。
また、鋳型質量そのものが重くなり、起重機（クレーンや反転機）が過荷重に成るおそれがあった。これを避けるためには鉄球の使用量を制限する必要があり、砂の使用量低減効果は上記実施例に比べて小さくなった。また作業者のハンドリング（手で持って作業することも考慮）時も重量物となり作業性が悪化した。 Reference Example 1 (Mullite artificial sand)
As Reference Example 1, an iron ball having an outer diameter of 160 mm, a weight of 7.5 kg, and a specific gravity of 3.5 was used in producing a mold having the same conditions as in Example 1. Since many iron balls were put in the direction with many gaps, the center of gravity was eccentric, and the mold and crane were sometimes damaged when the mold was reversed.
Further, the mold mass itself becomes heavy, and there is a possibility that the hoist (crane or reversing machine) is overloaded. In order to avoid this, it is necessary to limit the amount of iron balls used, and the effect of reducing the amount of sand used is smaller than in the above examples. Also, the handling of the operator (considering holding it by hand) was heavy and the workability deteriorated.
参考例２（ジルコン砂）
参考例２として、実施例２と同条件の鋳型を製造するに当たり、外径１５０ｍｍ、重さ０．９ｋｇ、比重０．６の鉄球を使用した。砂混練機から鋳型に砂を落とし入れると、その勢いで鉄球が移動することがあり、随時位置を修正するため作業性が落ちた。また、強度が弱く型バラシの落下時に破損するものがいくつか見受けられた。 Reference Example 2 (Zircon sand)
As a reference example 2, an iron ball having an outer diameter of 150 mm, a weight of 0.9 kg, and a specific gravity of 0.6 was used in manufacturing a mold under the same conditions as in Example 2. When sand was dropped from the sand kneader into the mold, the iron ball might move with that momentum, and the workability decreased because the position was corrected at any time. In addition, some were found to be weak and damaged when the mold was dropped.
参考例２として、実施例２と同条件の鋳型を製造するに当たり、外径１５０ｍｍ、重さ０．９ｋｇ、比重０．６の鉄球を使用した。砂混練機から鋳型に砂を落とし入れると、その勢いで鉄球が移動することがあり、随時位置を修正するため作業性が落ちた。また、強度が弱く型バラシの落下時に破損するものがいくつか見受けられた。 Reference Example 2 (Zircon sand)
As a reference example 2, an iron ball having an outer diameter of 150 mm, a weight of 0.9 kg, and a specific gravity of 0.6 was used in manufacturing a mold under the same conditions as in Example 2. When sand was dropped from the sand kneader into the mold, the iron ball might move with that momentum, and the workability decreased because the position was corrected at any time. In addition, some were found to be weak and damaged when the mold was dropped.
上記参考例１、２においても、鉄球使用により充填に必要な砂使用量を低減できたが、質量バランス、強度などに問題が生じた。したがって、中空球体の質量、比重を適切に設定するのが望ましいことが明らかになった。
In the above Reference Examples 1 and 2, the amount of sand required for filling could be reduced by using an iron ball, but there were problems with mass balance and strength. Therefore, it became clear that it is desirable to set the mass and specific gravity of the hollow sphere appropriately.
本発明は、上述した実施形態に限定されるものではなく、適宜、変形、改良等が自在である。その他、上述した実施形態における各構成要素の材質、形状、寸法、数値、形態、数、配置場所、等は本発明を達成できるものであれば任意であり、限定されない。
The present invention is not limited to the above-described embodiment, and can be appropriately modified and improved. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.
本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。
Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
本出願は、２０１０年１０月１日出願の日本特許出願（特願２０１０－２２３９１７）に基づくものであり、その内容はここに参照として取り込まれる。
This application is based on a Japanese patent application (Japanese Patent Application No. 2010-223917) filed on October 1, 2010, the contents of which are incorporated herein by reference.
以上説明したように、本発明によれば、鋳物砂を粘結剤により硬化させ鋳型を造型する鋳型造型方法において、隙間なく形成された中空球体を粘結剤と混練した鋳物砂の間に配置して前記鋳型の造型を行うので、各形状の鋳型に対し砂の代替として汎用性のある中空球体を充填させることにより砂使用量および、それに伴う添加物使用量を削減できる効果がある。
また、製品から離れた位置に中空球体を配置することで、鋳物を研磨再生するにあたって、製品から離れ熱影響の少ない部位の未燃焼状態の残留添加物を抑制でき、研磨再生処理を軽減できる効果がある。 As described above, according to the present invention, in the mold making method for forming a mold by hardening the foundry sand with a binder, the hollow spheres formed without gaps are arranged between the foundry sand kneaded with the binder. Then, since the mold is molded, there is an effect that the amount of sand used and the amount of additive used therewith can be reduced by filling each shape of the mold with a general-purpose hollow sphere instead of sand.
In addition, by placing the hollow sphere at a position away from the product, when polishing the casting, it is possible to suppress the unburned residual additive in the part that is away from the product and has less heat influence, and to reduce the polishing regeneration process There is.
また、製品から離れた位置に中空球体を配置することで、鋳物を研磨再生するにあたって、製品から離れ熱影響の少ない部位の未燃焼状態の残留添加物を抑制でき、研磨再生処理を軽減できる効果がある。 As described above, according to the present invention, in the mold making method for forming a mold by hardening the foundry sand with a binder, the hollow spheres formed without gaps are arranged between the foundry sand kneaded with the binder. Then, since the mold is molded, there is an effect that the amount of sand used and the amount of additive used therewith can be reduced by filling each shape of the mold with a general-purpose hollow sphere instead of sand.
In addition, by placing the hollow sphere at a position away from the product, when polishing the casting, it is possible to suppress the unburned residual additive in the part that is away from the product and has less heat influence, and to reduce the polishing regeneration process There is.
１ 鉄球
２ 全周溶接部位
１０ 鋳枠
１１ 木型
１２ 砂型
１３ 製品 DESCRIPTION OFSYMBOLS 1 Iron ball 2 All-around welding part 10 Cast frame 11 Wood type 12 Sand type 13 Product
２ 全周溶接部位
１０ 鋳枠
１１ 木型
１２ 砂型
１３ 製品 DESCRIPTION OF
Claims (7)
- 鋳物砂を粘結剤により硬化させ鋳型を造型する鋳型造型方法において、隙間なく形成された中空球体を粘結剤と混練した鋳物砂の間に配置して前記鋳型の造型を行う鋳型造型方法。 In a mold making method in which molding sand is hardened with a binding agent to form a mold, a mold making method is performed in which the hollow spheres formed without gaps are arranged between the foundry sand kneaded with the binding agent to form the mold.
- 前記中空球体が鉄球である請求項１記載の鋳型造型方法。 The mold making method according to claim 1, wherein the hollow sphere is an iron ball.
- 前記中空球体は、金属板を半球状に加工し半球状の該金属板を全周溶接により接合されたものである請求項１または２に記載の鋳型造型方法。 3. The mold making method according to claim 1, wherein the hollow sphere is obtained by processing a metal plate into a hemispherical shape and joining the hemispherical metal plate by welding all around.
- 前記中空球体は、質量が１ｋｇ以上、５ｋｇ以下で、外径が５０ｍｍ以上、２５０ｍｍ以下である請求項１に記載の鋳型造型方法。 The mold making method according to claim 1, wherein the hollow sphere has a mass of 1 kg or more and 5 kg or less and an outer diameter of 50 mm or more and 250 mm or less.
- 前記中空球体の比重が、前記鋳物砂の比重の０．５倍から２．０倍の範囲にある請求項１に記載の鋳型造型方法。 The mold making method according to claim 1, wherein the specific gravity of the hollow sphere is in the range of 0.5 to 2.0 times the specific gravity of the foundry sand.
- 前記中空球体は、外径の異なる２種以上のものからなる請求項１に記載の鋳型造型方法。 The mold making method according to claim 1, wherein the hollow spheres are made of two or more kinds having different outer diameters.
- 鋳物砂間に複数配置されて鋳型の造型に用いられる造型材であって、隙間なく形成された中空球体からなり、該中空球体の比重が、前記鋳物砂の比重の０．５倍から２．０倍の範囲にある鋳型用造型材。 1. A molding material that is arranged between casting sands and used for molding a mold, and is formed of hollow spheres formed without gaps, and the specific gravity of the hollow spheres is from 0.5 times the specific gravity of the casting sand. Molding material for molds in the range of 0 times.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/876,579 US9132475B2 (en) | 2010-10-01 | 2011-09-27 | Mold molding method and mold molding member |
| EP11829141.8A EP2623230B1 (en) | 2010-10-01 | 2011-09-27 | Method for making mold and material for making mold |
| CN201180047791.8A CN103140310B (en) | 2010-10-01 | 2011-09-27 | Die molding method and mold forming material |
| KR1020137008291A KR101892309B1 (en) | 2010-10-01 | 2011-09-27 | Mold molding method and mold molding member |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2010223917A JP5473855B2 (en) | 2010-10-01 | 2010-10-01 | Mold molding method and mold molding material |
| JP2010-223917 | 2010-10-01 |
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| WO2012043588A1 true WO2012043588A1 (en) | 2012-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2011/072122 WO2012043588A1 (en) | 2010-10-01 | 2011-09-27 | Method for making mold and material for making mold |
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| US (1) | US9132475B2 (en) |
| EP (1) | EP2623230B1 (en) |
| JP (1) | JP5473855B2 (en) |
| KR (1) | KR101892309B1 (en) |
| CN (1) | CN103140310B (en) |
| WO (1) | WO2012043588A1 (en) |
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| CN103658504B (en) * | 2013-11-26 | 2016-06-29 | 滁州金诺实业有限公司 | The technique of sand-cast aluminium alloy strand |
| CN104226901A (en) * | 2014-09-05 | 2014-12-24 | 江苏万盛铸造有限公司 | Resin sand mould |
| KR101726148B1 (en) * | 2016-04-07 | 2017-04-11 | 해원산업(주) | Molding sand saving apparatus for casting and casting method thereby |
| US20180111187A1 (en) * | 2016-10-21 | 2018-04-26 | Mcconway & Torley, Llc | Method and System for Casting Metal |
| CN106938316A (en) * | 2017-03-07 | 2017-07-11 | 杨邦树 | A kind of casting technique of energy-saving mould and the application mould |
| CN111545708B (en) * | 2020-05-12 | 2021-08-06 | 唐山昊中科技有限公司 | Negative-pressure casting process for precoated sand shell type iron sand |
| JP7364762B1 (en) | 2022-10-07 | 2023-10-18 | 旭有機材株式会社 | Recycled sand raw material composition and method for producing the same, and method for producing recycled sand and resin-coated sand |
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| JPS5645250A (en) * | 1979-09-19 | 1981-04-24 | Natl Res Inst For Metals | Fixing method of water-soluble mold |
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- 2010-10-01 JP JP2010223917A patent/JP5473855B2/en active Active
-
2011
- 2011-09-27 KR KR1020137008291A patent/KR101892309B1/en active IP Right Grant
- 2011-09-27 WO PCT/JP2011/072122 patent/WO2012043588A1/en active Application Filing
- 2011-09-27 US US13/876,579 patent/US9132475B2/en active Active
- 2011-09-27 CN CN201180047791.8A patent/CN103140310B/en active Active
- 2011-09-27 EP EP11829141.8A patent/EP2623230B1/en active Active
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| JPS60131246U (en) * | 1984-02-10 | 1985-09-03 | 三菱重工業株式会社 | mold equipment |
| JPH02220730A (en) * | 1989-02-21 | 1990-09-03 | Okamoto:Kk | Casting method for using organic self-hardening mold |
| JPH1024344A (en) * | 1996-07-09 | 1998-01-27 | Akira Atoda | Method for recovering volume increasing material of molding sand and device therefor |
| JP2010023917A (en) | 2008-07-24 | 2010-02-04 | Japan Ae Power Systems Corp | Electron beam radiation apparatus for stand pouch sterilization |
| JP2011020148A (en) * | 2009-07-16 | 2011-02-03 | Jfe Techno Research Corp | Hollow ball for mold filling, and casting method using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2623230B1 (en) | 2017-12-27 |
| JP5473855B2 (en) | 2014-04-16 |
| CN103140310A (en) | 2013-06-05 |
| KR101892309B1 (en) | 2018-08-27 |
| EP2623230A1 (en) | 2013-08-07 |
| EP2623230A4 (en) | 2016-03-30 |
| KR20130118312A (en) | 2013-10-29 |
| CN103140310B (en) | 2016-01-20 |
| US20130186589A1 (en) | 2013-07-25 |
| US9132475B2 (en) | 2015-09-15 |
| JP2012076118A (en) | 2012-04-19 |
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